CVE-2017-0197 in OneNote
Summary
by MITRE
Microsoft OneNote 2007 SP3 and Microsoft OneNote 2010 SP2 allow remote attackers to execute arbitrary code via a crafted document, aka "Microsoft Office DLL Loading Vulnerability."
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Analysis
by VulDB Data Team • 11/28/2022
The vulnerability identified as CVE-2017-0197 represents a critical security flaw in Microsoft OneNote versions 2007 SP3 and 2010 SP2 that enables remote code execution through maliciously crafted documents. This vulnerability stems from improper handling of dynamic link library (DLL) loading mechanisms within the application's document processing pipeline, creating an exploitable condition that adversaries can leverage for unauthorized system compromise. The flaw specifically manifests when OneNote attempts to load external libraries during document rendering, allowing attackers to manipulate the loading process and execute malicious code with the privileges of the targeted user.
The technical nature of this vulnerability aligns with CWE-427 Uncontrolled Search Path Element, where the application fails to properly validate or restrict the search paths used for loading dynamic libraries. When a malicious document is opened, OneNote's document parser encounters crafted elements that trigger the loading of attacker-controlled DLL files from predictable or manipulable locations. This behavior violates fundamental security principles of least privilege and secure library loading practices, as the application does not properly isolate or validate the origins of dynamically loaded components. The vulnerability exploits the Windows DLL search order mechanism, where the system attempts to load libraries from the current working directory before checking system directories, allowing attackers to place malicious DLLs in strategic locations.
From an operational perspective, this vulnerability presents significant risk to enterprise environments where Microsoft OneNote is widely deployed, particularly in organizations that do not maintain strict network segmentation or endpoint protection controls. Attackers can craft malicious OneNote files that, when opened by unsuspecting users, automatically execute malicious payloads without requiring user interaction beyond document opening. The exploit can be delivered through various attack vectors including email attachments, web downloads, or compromised collaboration platforms. This vulnerability is particularly dangerous because it operates within the context of a legitimate productivity application that users frequently interact with, making social engineering attacks more effective and harder to detect. The execution occurs with the user's privileges, potentially enabling lateral movement, privilege escalation, or data exfiltration depending on the attacker's objectives.
The attack surface extends beyond simple remote code execution to encompass broader exploitation capabilities within enterprise networks. According to ATT&CK framework, this vulnerability maps to multiple techniques including T1203 Exploitation for Client Execution and T1059 Command and Scripting Interpreter, as attackers can leverage the compromised OneNote process to execute further malicious commands or establish persistent access. Organizations implementing zero-trust security models find this vulnerability particularly concerning as it demonstrates how legitimate software can be weaponized for unauthorized access. Mitigation strategies should include immediate deployment of Microsoft security patches, implementation of application whitelisting policies, network monitoring for suspicious file downloads, and user education regarding the dangers of opening untrusted Office documents. Additionally, security teams should consider deploying endpoint detection and response solutions that can monitor for anomalous DLL loading behaviors, as these systems can help detect exploitation attempts before they result in successful compromises. The vulnerability also highlights the importance of maintaining current security hygiene and demonstrates how legacy software versions remain particularly susceptible to exploitation due to the absence of modern security controls and patch management practices.